What are the main differences between high low frequency inverters, and what are the main features of Xindun Power's high-frequency inverters?
LF vs HF inverter, what is the difference? LF inverter means low frequency inverter, while HF inverter means high frequency inverter.
Below we introduce the difference between high and low frequency inverter through this article:
In various promotional leaflets, customers will only see solar inverters or hybrid inverters. In fact, depending on the use environment, there are two applicable types of inverters: high-frequency inverters and low-frequency inverters.
Let's start with the simplest and most intuitive difference: low-frequency inverters have a large transformer built in, while high-frequency inverters have only a very small transformer as a voltage or current buffer, or simply no transformer (Xindun power's high-frequency inverter is equipped with a transformer).
For inductive loads such as water pumps, motors, and large air conditioners, the power at the moment of opening will be 3-6 times its rated power. For example, a 1kw water pump will have a power of 3kw-6kw at the moment of opening. The transformer of the low-frequency inverter can play a role in buffering and bearing the impact. Here we also correct the misunderstanding that we match inverters: it is not that a 1kw load is matched with a 1kw inverter. If it is an inductive load, a 1kw loads needs to be matched with a 3kw low-frequency inverter. For a high-frequency inverter, a 4-5kw inverter is required to work with it.
Secondly, the so-called high frequency and low frequency are not the 50Hz or 60Hz marked on the inverter, but the frequency of inversion between DC and AC. Under high-frequency conditions, high-frequency inverters discharge the battery and invert the output energy, which can greatly reduce the energy loss in the process.
Here we need to add a detail: high-frequency inverters are inverted under high voltage conditions, that is, they can use the high-voltage DC input from the solar panel to directly invert into high-voltage AC, and then output it to the AC load for use. Low-frequency inverters can only invert the low-voltage DC of the battery into low-voltage AC (low-voltage inversion, so it can only be low-frequency inversion), and then boost it through a transformer to become high-voltage AC and then output it to the AC load for use. This also explains why the output efficiency of high-frequency inverters is 93-94%, while the output efficiency of low-frequency inverters is 85%. But the shortcomings are also obvious: for inductive loads, a relatively high-frequency inverter with relatively large power is required to carry the load (because there is no built-in large transformer).
Finally, there is the difference in the solar input range of the two inverters. With the same 48vdc specification, the maximum solar input of the high-frequency inverter is 500vdc, and that of the low-frequency inverter is 150-180vdc. Why is the difference so big? Because it is determined by the orientation of their respective working principles: for high-frequency inverters, the inversion logic is inverted at high voltage, while the low-frequency inverter is inverted at low voltage, so the MPPT design logic of each is different.
The design logic of high solar input of high-frequency inverters has indeed brought a lot to the subsequent derivative technology. For example, Xindun Power's high-frequency hybrid inverter: HFP and HF series, in addition to being able to work without batteries and directly invert solar DC to AC, also derives the output "compensation" function: when the power of the solar inverter does not reach the rated working power of the load, Xindun Power's hybrid inverter will sense the situation through intelligent chip control and call the power from the mains or battery to compensate the output of the inverter, ensuring that the load works at the rated power and extending the working life of the load.
In the battery connection working mode, Xindun Powe's HFP and HF hybrid inverter will call the BMS system inside its program to achieve real-time communication with the lithium battery, so that all battery data are synchronized with the lithium battery, avoiding the induction delay of the inverter still allowing the lithium battery to work when the lithium battery is too low voltage or fully charged.
Our Xindun Power HF series inverter is also equipped with dry contacts to achieve instant switching between the mains and the generator, ensuring continuous input of external power.
If you want to know more about high and low frequency inverter, why not contact Xindun Power? Let us introduce you to more product details.
